The following file is copied from vimcasts.org(Its only for learning purpose,hope the site owner doesn't mind it), its probably the easiest of challenges.Our goal is to delete every line which doesn't contain a hash signs. The remaining hash signs with numbers are then sorted to get the final output.

In [this vimcast][1], a featured gist from Tim Pope shows how to quickly make a simple table structure. How fast can you convert it to pandoc's markdown style?
[1]: http://vimcasts.org/episodes/aligning-text-with-tabular-vim/